Yesterday I upgraded Ubuntu 19.04 to 19.10. The update went smoothly, but system boot into graphics mode fails with the new kernel 5.3.0-19. This applies not only to X but also Plymouth. Starting system in text mode is possible. Instead of gdm login, I got a blinking purple screen. When started in graphics mode, it hangs on Plymouth (black screen). Nomodeset works, but 1024x768 only is provided.
I'm able to boot the system correctly on old kernel 5.0.0-32 which works fine.
I have Intel UHD 630 graphics from the Intel Core i7-9700 APU.